grubby

 

Step 1: Check system UEFI hai ya nahi

Terminal me:

ls /sys/firmware/efi

Agar folder dikh gaya → system UEFI hai (most cases)
Error aaye to batana.

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Step 2: EFI partition identify karo

lsblk

EFI usually hota hai:

• 100–500 MB

• FAT32

• Type: vfat
  Example:

nvme0n1p1  300M  vfat

Maan lo EFI partition hai: /dev/nvme0n1p1
(ya /dev/sda1 ho sakta hai)

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Step 3: EFI partition mount karo

sudo mount /dev/nvme0n1p1 /boot/efi

Error aaye to partition name galat hai, bata dena.

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Step 4: GRUB reinstall (MAIN COMMAND)

sudo grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=Zorin --recheck

Agar ye success ho gaya → 80% kaam ho gaya.

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Step 5: GRUB config update karo

sudo update-grub

Isme:

• Zorin OS

• Windows Boot Manager

dono detect hone chahiye.

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Step 6: Reboot

sudo reboot

USB ya kuch mat lagana.
Restart pe GRUB menu aana chahiye.